<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>

    </style>
	<script type="text/javascript" src="../js/vue.js"></script>

</head>
<body>
    <!-- 准备好一个容器 -->
    <div id="root">
        <h1>学生信息</h1>

        <button @click="student.age++">年龄+1岁</button><br/>
        <button @click="addSex">添加性别属性，默认值：男</button><br/>
        <button @cilck="student.sex = '未知' ">修改性别</button><br/>
        <button @click="addFriend">在列表首位添加一个朋友</button><br/>
        <button @click="updateFirstFriendName">修改第一个朋友的名字为：张三</button><br/>
        <button @click="addHobby">添加一个爱好</button><br/>
        <button @click="updateHobby">修改第一个爱好为：开车</button><br/>
        <button @click="removeSmoke">过滤掉爱好中的抽烟</button>

        <h3>姓名：{{student.name}}</h3>
        <h3>年龄：{{student.age}}</h3>
        <h3 v-if="student.sex">性别：{{student.sex}}</h3>
        <h3>爱好：</h3>
        <ul>
            <li v-for="(h, index) in student.hobby" :key="index">
                {{h}}
            </li>
        </ul>
        <h3>朋友们</h3>
        <ul>
            <li v-for="(f, index) in student.friends" :key="index">
                {{f.name}}--{{f.age}}
            </li>
        </ul>
    </div>
</body>
<script type="text/javascript">
		Vue.config.productionTip = false //阻止 vue 在启动时生成生产提示。
        const vm = new Vue({
            el: '#root',
            data: {
                student:{
                    name: 'tom',
                    age: 18,
                    hobby: ['抽烟', '喝酒', '打游戏'],
                    friends: [
                        {name: 'jerry', age: 35},
                        {name: 'tony', age: 36}
                    ]
                }
            },
            methods: {
                addSex(){
                    // Vue.set(this.student, 'sex', '男')
                    this.$set(this.student, 'sex', '男')
                },
                addFriend(){
                    this.student.friends.unshift({name: 'jack', age: 70})
                },
                updateFirstFriendName(){
                    this.student.friends[0].name = '张三'
                    // this.student.friends[0].age = '5'

                },
                addHobby(){
                    this.student.hobby.push('学习')
                },
                updateHobby(){
                    // this.student.hobby.splice(0, 1, '开车')
                    // Vue.set(this.student.hobby, '0', '开车')
                    this.$set(this.student.hobby, 0, '开车')
                },
                removeSmoke(){
                    //filter不影响原数组的改变；Vue也没有包裹这个 filter
                    this.student.hobby = this.student.hobby.filter((h) => {
                        return h !== '抽烟'
                    })
                }
            }
        })
</script>
</html>